Stapling machine



Nov. 21, 1933. A. H. MAYNARD v STAPLING MAC'HINE Filed July 9, 1930 2 Sheets-Sheet l Nov. 21, 1933. A. H. MAYN'ARD l 1,936,063

STAPLING MACHINE Filed July 9, 195o 2 sheets-sheet 2 @hmm ` Patented Nov. 21, 1933 d y 1,936,063

UNITED STATES PATENT OFFICE STAPLIN G MACHINE Arthur l1. Maynard, Warwick, R. I., assignor to Boston Wire Stitcher Company, Portland, Maine, a corporation of Maine Application July 9, 1930. Serial No. 466,768

17 Claims. (Cl. 1 3) This invention relates to stapling-machines ing plants whereit is required to attach sheets and consists in improvements in the construction of paper, secure labels or tags to various articles and method of operation of the same. of commerce and for any other similar purpose.

One object of the invention is to provide a Ingeneral, the improved stapling-machine or demachine or device of the type specified which is vice comprises a base adapted to rest on any suit- 60 compact in size, convenient to operate and efii- `able support; a swinging stapling-arm pivoted to cient and durable in use. the rearward end of the base and normally held Another object of the invention is to provide in raised position to receive the work under its a mach' .1e or device of the type specified having forward end; a magazine for the staples in the improved staple-feeding and guiding means to stapling-arm; a staple-driver on the arm with 35 prevent the staples from crowding, riding up one means for manually operating it to drive the over anothe.. lr becoming misalined as they feed staples through the work; means for successiveto the staple-driver. ly feeding the staples to the staple-driver; and

Another object of the invention is to provide an adjustable clincher-anvil mounted on the base l5 in a machine or device of the type specified an beneath the staple-driver for cooperation there- 70 improved clincher-anvil which is adjustable to with to clinch the legs of the staple against the vary the method of clinching the legs of the staple underside of the work.

against the underside of the work. The base 2 of the machine is preferably con- Another object of the invention is to provide structed of molded material such as a phenolic 2O a machine or device of the type speciiied having condensation product for the purpose of saving its parts adapted for economical methods of weight and tdenhance the ornamental appearmanufacture and easy assembling. ance of the appliance by giving it any desired Further objects of the improvement are set color in contrast to the bright metal parts of the forth in the following specification which demachine. Asillustratedinthe drawings, the base scribes a preferred form of construction of the 2 is of hollow construction embodying a fiat top invention, by way of example, as "illustrated by bordered by an overhanging beveled flange or the accompanying drawings. In the drawings: rim 3. At the corners on its underside are hollow Fig. 1 is a view in side elevation of a staplingbosses having rubber plugs 4 inserted therein to machine embodying the present invention; provide feet which hold the device from slipping "-0 Fig. 2 is a vertical sectional view of the sta-` on the desk or .other surface on which it rests. 85 pling-machine showing its parts in position as The rearward end of the base is provided with the staple is applied to the work; a`rectangular opening 5 having upstanding ribs Fig. 3 is a front elevation of the device with or walls 6 at its sides for receiving a pivot-pin 'l the parts in position as illustrated in Fig. 1 vand on which the stapling-arm 10 is hinged. 5 showing the base of the machine in partial sec- 'I'he stapling-arm 10 is preferably constructed 90 tion to illustrate the arrangement of the adjustfrom a single strip of sheet-metal folded into able clincher-anvil; channel-shape as shown most clearly in Fig. 6, the Fig. 4 is a front view of the device with the upper edges of its sides being bent inwardly to parts in position as illustrated in Fig. 2 and the provide overhanging lateral flanges 11 employed clincher-anvil shown in vertical section to illusfor a 'purpose as later explained. The sides of the trate its action on the legs of the staple; arm 10 are extended upwardly at its forward end Fig. 5 is a plan view of the device, part-seetion-` A to form a stapling-head or casing l2 for the staal on line 5-5 of Fig. 2; pling-mechanism, the anges l1 being continued Fig. 6 is a sectional view through the pivot of at 13 on the rearward side of the head and ex- 1 the stapling-arm taken on line 6-6 of Fig. 2; tended inwardly at the top with their edges 14.l 100 Fig. 'l is a detailed view of the forepart of the abutting to close the upper part of the head. A stapling arm, part-sectional on line 7 7 of Fig. rivet 15 is inserted through the sides of the head 5; and y and headed over as indicated in Figs. 1 and 2 to Fig. 8 is a. plan View of the clincher-anvil showprovide a closed structure at the top. ing the arrangement of the opposite grooves or Extending longitudinally of the-channel in the 105 depressions therein which act to clinch the legs arm 10 is a staple-core 17 constructed of sheetof the staples in different directions. metal folded into channelor U-shape with its The inventionis herein illustrated as embodi sides spaced away from the sides of the ann. in a stapling-machine in the form of an ofiice The staple-core 17 supports the staplessinstradappliance for use on the desk or in manufacturvdied relation thereacross to adapt them to slide 110 within the arm 10 as they are'fed' to the staplingmechanism at its forward end. It will be noted by reference to Fig. Ev that the overhanging iianges 11 on. the sides of the arm 1o overlie the upper edges of the sides oi the staplecore 17 with a space therebetween in which the staples slide. The staples s rest across the relatively narrow edges of the staple-core so that only slight frlctional resistance is offered to their sliding action and the anges 11 serve as guides to prevent them from riding up out of position or catching one on'another as they feed to the stapling-mechanism. The staple-core 17 is secured xedly to the bottom of the stapling-arm 10 by .means of Atwo studs 18 inserted therethrough and screwed into a solid block 20 on the underside of the arm. The block 2o serves asI the hinge for the arm 10 with the pivot-pin 7 passing through a lateral hole 21 therein and heid in place by friction, its surface being lmurled or uted as shown in Fig. 6 to provide a tight dt. The projecting end portions o'i the pin 7 are smooth to adapt them to turn freely in holes in the ribs 6 on the base 2.

iWhen it is desired to detach the stapling-arm from the base for repair or replacement or" any part or" the mechanism this is easily accomplished by simply driving out the pin 7. The base 2 is formed on its top with a pocket 3 adjacent the opening 5 and held therein is a helical spring 22 which bears against the underside or" the arm l0 to normally hold its forward end in raised position as illustrated in Fig. 1. A boss 9 on the top oi' the base at its rearward end is adapted to engage the tail-end of the ami 10 to limit its upward movement under the action of the spring 22. Referring particularly to Figs. 5 and 7 of the drawings, the forward edges of the sides ofthe head 12 are' bent inwardly to provide vertical flanges 24 for guiding the staple-driver 25 which is slidable on the head to apply the staples to the work. Parallel withthe flanges 24 are similar guide-flanges 26 bent inwardly from side-plates 27 abutting the inner walls of the head 12. The side-plates 27 may be spot-welded or otherwise suitably secured to the sides of the head 12, their upper portions being cut-away at 23 to clear the rivet 15. As shown in Fig. 7 of the drawings the flanges 24 on the lsides of the head. cooperate with the flanges 26 on the sideqilates 27 to provide vertical grooves or guideways 28 which receive the lateral edges of the staple-driver 25. The staple-driver 25 is formed of two overlying iiatfplates 29 and 30, the rearward one 30 being of less thickness than the forward one 29 with its lateral edges projecting therebeyond to slide in the grooves 28 at the opposite sides of the staple-head, see Fig. 5. The forward plate 29 slides in the space between the vertical flanges 24 on the opposite sides of the head 12, being of less width than the rearward plate 30 and also extending slightly below its lower edge as indicated in Figs. 2 and 4. The forward plate 29 is thus adapted to press against the top of the work as the lower edge of the staple-driver proper, that is, the plate 30, rides on the top of the staple at the completion of the driving operation.

vThe staple-driver 25 'is operated from a reclprocable plunger 32 having sides 33 straddling the sides of the stapling-head 12 and carrying a hand-rest or knob 35 at its top. As shown most clearly in Figs. 2, 3 and 5, the staple-driver -25 is secured flat against the inner side of the front wall of the reciprocable plunger 32 by means of hollow rivets 36 and37. The lower rivet 37 is. formed Witt` a square head 38 adapted to strike against shoulders 39 formed on" the inturned anges 26 of the side plates 27 whereby to limit the upward movement of the slidaole plunger 32.

The plunger 32 is normally maintained in raised position as illustrated in Fig. 1 by means of a helical spring 40. The spring 40 is held in a cup-like socket 41 seated between the sides of the head 12 and provided with an overhanging anged rim 42 which rests on the inturned iianges at the top of the head.

The knob or hand-rest 35 is preferably formed of phenolic-condensation product or similar molded material of a color matching the color of the base, its bottom resting across the top of the plunger 32 and secured in place thereon by means as next described. The sides 33 of the plunger 32 are folded inwardly at the top forming wings v 43, see Fig'. 2, fitting Within a recess 44 in the knob 35. A headed thimble 45 is inserted axially through the knob 35 and extends down through an opening in the abutting wings 43 with its lower edge swaged outwardly in a flange 46 which rivets the knob to the top of the plunger. The thimble d5 forms an inverted socket for receiving the upper end of the spring 4G which bears m0 against its closed. end to force the plunger upwardly in the manner as before indicated.

It will oe noted by reference to Figs. 2 and 7 of the drawings that the staple-core 17 extends clear through the channel of the arm 10 with the forward edges of its sides forming a continuation of the groove 28 in which the staple-driver 25 slides. The staples s slide along the core 17 in.- to positionx beneath the staple-driver, when the latter is elevated as shown in Fig. `1, and are guided by the lower edges of the side-plates 27 as they feed forward beyond the iianges l1 on the arm lo. The side-plates 27 therefore serve this furtherpurpose of preventing the staples from riding up on the core at the forward end thereof.

Pivoted between the sides of the staple-core -17 is a staple-supporter 50 adapted to suspend the foremost staple in raised position as it is fed off from the end o the core. The-staple-supporter 50 takes the form of a strip of fiat sheetmetal bent into substantially S-shape to form a loop 51 overhanging a pivot or cross-pin 52 driven through the sides of the staple-core 17. The

staple-supporter 50 is extended forwardly in a1'25 leg 53 which is bent downwardly at its end to adapt it to underlie the head or cross-bar of the staple s when the supporter is rocked into raised position as illustrated in Fig. 7 of the drawings. extending tail-piece curled around at 54 to adapt it to bear against the underside of a relatively flat leaf-spring 55 fastened in the bottom ofthe staple-core 17. The leaf-spring 55 is held down The supporter 50 has a rearwardly 30 against the bottom of the core 17 by means of a 135 cross-pin 56 with its rearward end engaging an abutment 57 bformed by slitting the stock of the core and bending it upward as indicated in Fig. 2. Through this simple form of construction the spring 55 is secured in place with its forward 140 end adapted to. bear againstl the end of the tail-piece 54 to cause it to rock the supporter 50 to raise its forward end beneath the staple as it is fed off from the end of the core 17.

When the plunger 32 is depressed to slide the 145 staple-driver 25 downwardly in the grooves 28 of the head 12 the supporter will be rocked into the lposition illustrated in Fig. 2 to permit the staple to slide off from` its end as it is driven through the work.

The staples s are slid forwardly along the core 17 in the arm 10 to feed them to the driver by means of a staple-pusher as usually provided. The lstaple-pusher is constructed of sheetmetal bent into inverted U-shape to adapt' it to overlie the top and straddle the sides of the staple-core 17, see Figs. 2 and 5. The staplepusher 60 is urged' forwardly on the core 17by a spring 62 consisting of a strip of relatively thin tempered steel terminating' at one end in a volute coil 63 held between the sides of the stapling-head l2. The spring 62 is anchored to a cylindrical member 65, its end being bent inwardly and folded over at 64 for this purpose. The cylindrical member 65 consists of a short length of tubing having one of its edges turned inwardly at 66 to engage the folded end 64.01? the spring 62. The tubular member 65 is inserted through circular openings 67 in the sides 13 of the head l2 and openings 68 in the side-plates 27, these latter openings being of peculiar form to provide hook-shaped prongs 69 which engage across shoulders or abutments at the ends of the member 65, see Fig. l, to fasten the latter in place. In this way a secure anchorage is provided for the spring 62 while adapting it to be disconnected by simply otating the tubular member 65 in a clockwise direction and sliding it through the openings 68 in the sides of the head 12.

vThe rearward or tail-end of the spring 62 is attached to the top of the staple-pusher 60 through an ingenious construction which also fastens a finger-grip or knob 70 to the pusher to provide for its manual operation when the ma chine is to be filled with staples. The lingerpiece 70 is preferably constructed of phenolic condensation product in the form of a cylindrical knob 71 having feet 72 at its sides resting on the top of the pusher. A metal loop or stirrup 73 encircles the knob 7l, being fitted to a peripheral groove 74 therein, see Fig. 5, with its legs passing down through slits in the feet 72 and openings in the spring 62. The legs of the stirrup are inserted through .slits in the top of the pusher 60 with their ends clinched inwardly to tie the several parts together. The sides of the knob 7l may be concaved and knurled, or scored with concentric grooves 75 as illustrated in Fig. l, to present a better grip to the lingers and also provide ornamentation for this part.

At the forward end of the base 2 is an upstanding circular boss 77, through which extends a circular hole 78 counterbored at the top to provide a recessed seat 79 for a disk-like clincheranvil 80. Riveted to the underside of the clincher-anvil 80 is a plate 8l folded at its center to provide downwardly extending ears 82 which are formed at their ends with cylindrical bearings 83. Adapted to slide in the cylindrical bearings 83 are two opposite plunger-pins 85 having pointed ends which are projected radially outward from their bearings under the action of a helical spring 86 extending between their reaward ends. The plungers 85 have annular flanges 87 engaging against the inner ends' of the bearings 83 to limit their movement under the action of the spring 86 the ends of which surround reduced portions 88 of the plungers. The points of the plungers 85 are adapted to engage with V-shaped notches 84 disposed at equal intervals around the edge of the hole 78 as shown in Fig. 3 of the drawings. It will be noted by reference to this view that the bottom edge of the opening 78 in the base 2 is beveled outwardly at 89 so that the engagement of the ends of the plungers therewith maintains the anvil in place in its seat 79 while adapting it to be rotatively adjusted with thc points of the plungers riding out of one set of notches and reengaging in another set. The clincher-anvil 80 is thus held in place in the base 2 without the use of screws, rivets or other fastening means except the plungers 85 which have the additional function of operating as a ratchet to maintain the anvil in whatever position it may be adjusted.

The purpose of making the clincher-anvil adjustable is to provide for clinching the legs of the staple in different directions in accordance with the requirements of the work to be performed. Fig. 8 of the drawings is a plan view of the clincher-anvil 80 showing its upper face provided with two sets of grooves which extend at vright angles to each other. The groove or depression 90 extends diametrically of the anvil 80 with its opposite ends at equal distances from the axis thereof in proportion to the width of the staple employed in the machine. This form of staplinggroove provides for bending both legs of the staple inwardly in the manner as most generally used for attaching sheets of paper and other objects. The two opposite grooves 91 and 92 are disposed in such manner as to bend one leg of the staple inwardly and the other outwardly as indicated in Fig. 4 of the drawings, one groove 91 being radial with respect to the axis of the anvil and the other groove 92 being arranged in line therewith but spaced outwardly away from the axis. Other forms of clinching-grooves may be provided on the face of the anvil 80 for bending the staples in still different directions, it being noted that the notches 84 in the base 2 are so disposed relatively to the different sets of grooves as to lock the anvil in the position to which it is adjusted with one set of grooves alining with the bottom of the staple-driver 25 to cooperate therewith as the staples are driven down through the work.

The construction and arrangement of the parts of the machine as embodied in the present example of the inventioin having been described in detail, the method of operation of the device will next be explained. Referring to Figs. 1 and 2 of the drawings the magazine in the arm 10 of the machine is lled with staples by drawing back the staple-pusher 60 to remove it from the staplecore 17, the coil of the spring 62 unwinding for this purpose. withdrawn from the arm l0 a stick of connected staples, or in other cases a plurality of separate staples, are slid into the rear end of the arm with their legs straddled across the sides of the core 17. The staple-pusher 60 is then replaced in the magazine and its spring 62 will draw it forward on the core 17 to cause it to act against the rearmost staple to push the series forward to bring the foremost staple beneath the driver 25 as shown in Fig. l of the drawings.

With the machine loaded with' staples the work'is laid across the top of the anvil 80 and the operator presses down on the knob 35. Under this pressure the arm l0 is first carried down against the work w, as shown in Fig. 2, and thereafter the plunger 32 is forced downwardly on the head 12. As the plunger 32 is depressed against the tension of its spring 40 the stapledriver 25 slides down in the grooves or guideways 28 with the lower edge of its plate 30 irnpinging against the head of the staple s therebeneath; it having been previouslyexplained that the staple-supporter 50 is normally mainsol After the staple-pusher has been tained in raised position as shown in Fig. 7 to prevent the fed staple from dropping down in the grooves 28. 'As pressure on the knob 35 is continued the. staple-driver 25 will be carried down past the forward end of the staple-core 17 to drive the legs of the staple s through the work -w. As the points ofthe staple pierce through the paper or other material they engage with one or the other set of clinching-grooves t0 cause them to be bent over and clinched on the underside of the work as shown, forl example, in

Fig.. 4 of the drawings. When the pressure on the knob 35 is released after the stapling operation is completed the plunger 32 will rst be raised on the head 12, due to its spring 40 being stronger than the spring 22 which lifts the arm 20. As the staple-plunger 32 is raised by the spring 40 the head 38 of the rivet 37 strikes against the shoulders or abutments 39 on the inner sides of the head 12 to limit the upward movement of the staple-driver. As the stapledriver 25 is thus raised above the end of the core 17 the staple-pusher 60 is urged forwardly by its spring 62 to feed another staple s into p0- sition beneath the driver to prepare the machine for the next operation. During the retraction of the staple-driver 25 the staple-supporter 50 is rocked upwardly by its spring 55 to cause it to receive the next .staple fed off from the core 17.

It has been noted that the staples s slide along the magazine in the arm 10 with their heads supported across the upper edges of the sides of the core 17 and held down thereagainst by the overhanging flanges 11. Through the present novel and improved construction of the staplecore 17 the staples rest on the narrow edges of its upturned sides and therefore encounter a minimum of frictional resistance in sliding therealong; it being noted that with the usual construction the staples are' supported on a solid core or one having a top of the full width of the staple and consequently the resistance Vto their sliding movement is mu'ch greater. "lhe present device therefore provides an important improvement in this respect, in that the staples are prevented from crowding or jamming in the magazine of the machine or from riding up one over lanother to clog the feeding action.

It will be observed that the present improved machine is of extremely simple construction with a minimum of screws and rivets employed to fasten its parts together. Moreover, the elements of the device are so designed and co-related as to provide for constructing them from sheet-metal struck up in dies, thereby effecting considerable economies in the cost of manufacture of the complete machine.

The stapling-head and the operating parts carried therein are combinedin an extremely compact and neat arrangement with all of theA mechanical elements practically concealed from view. The complete machine thus has a more finished and ornamental appearance with its colored base,A plunger-knob and staple-pusherof construction, it is to be understood that various modifications may be made in the design and arrangement 'of its parts without departing from the spirit or scope of the invention. Therefore, without limiting myself in this respect, I claim:

1. In a machine of the type specified, the combination of a channel-shaped arm folded from a Vcombination of a one-piece channel-shaped hollow arm having a bottom, opposite parallel sides with overhanging flanges at the top, a U- shaped sheet-metal staple-core in the arm having opposite parallel sides disposed in spaced relation i to the sides of said arm with their upper edges spaced beneath the overhanging flanges thereon, staple-driving means at the end of the arm, and means to feed the staples along the core to suc- I cessively position them beneath the staple-driving means.

3. In a machine of the type specied, the combination of a one-piece channel-shaped arm having a bottom, opposite parallel sides and inwardl ly extending flanges at the top of its sides, the sides of the arm being formed at one end with upwardly projecting extensions having inwardly folded portions disposed with Itheir edges abutting, a staple-core extending longitudinally within the arm beneath the flanges on its sides to adapt it to receive the staples in straddled relation thereon to be held in place by the flanges, a staple-driver reciprocable on the arm and guided by the upstanding portions thereof, and means to feed the staples along. the core in the l arm to successively deliver them beneath the staple-driver.

4. In a machine of the type specified, the combination of a channel-shaped arm constructed from a single strip of sheet-metal folded to form 1 a bottom and sides with fianges projecting in- Wardly at the top of the sides, the sides of the arm extending upwardly and formed with vertical fianges folded inwardly at its forward end, side plates held against the inner walls of the 1 upstanding side portions of the arm and formed with flanges bent inwardly in opposite relation to the vertical flanges on the arm to provide guideways therebetween, a driver reciprocable in said guideways, means for slidably supporting the 1 staples within the arm, and means-for'feeding the staples along the arm to successively position them beneath the staple-driver.

5. In a machine of the type specified, the combination of a channel-shaped arm having op- `1 posite parallel sides with flanges folded inwardly at thetop thereof, said sides extended upwardlyA at the end of the arm and folded inwardly withtheir edges abutting with an opening left therebetween, a thimble-shaped socket lmember held in the opening between the sides of the upstanding portions of the arm, a plunger slidable at the forward end of the arm, a staple-driver reciprocable with the plunger, a socket in the head of the plunger, and a spring held in the opposite sockets 1 longitudinally wit and acting between the plunger and the arm to normally maintain the driver in raised position.

6. In a machine of the type specified, the combination of a channel-shaped arm having its sides extended in upstanding portions at its forward end and folded inwardly to form vertical anges, plates held against the inner walls of the upstanding portions of the arm and provided with inwardly projecting flanges cooperating with the first-mentioned flanges to form guiding grooves, a plunger straddling the sides of the forward portions of the arm, a staple-driver secured to the plunger and provided with splines slidable in the guideways at the sides of the arm, a spring acting between the plunger and the arm to normally maintain the staple-driver in raised position, and means for feeding staples along the arm to successively deliver them beneath -the staple-driver.

7. In a machine of the type specified, an arm constructed of a single strip of sheet-metal folded into channel shape with portions of its sides extending upwardly and folded inwardly with their edges abutting, said upstanding portions of the arm provided with inwardly projecting flanges, a sheet-metal plunger having a vertical front wall with folded sides straddling the sides of the arm, a staple-driver secured to the wall of the plunger with its edges slidable at the rear of the flanges on the arm, a spring acting on the plunger to maintain the staple-driver in raised position, and a staple-core extending longitudinally within the arm with its forward end adjacent the path of the staple-driver to adapt the staples to be delivered therefrom in position to be driven into the work.

8. In a machine of the type specified, the combination of an arm, a staple-driver reciprocable at the end of the arm, a staple-core extending longitudinally within the arm and adapted to have the staples straddled thereacross, :means for feeding the staples along the core to successively position them beneath the staple-driver, a cross-pin extending between the sides of the arm, a staple-supporter comprising a strip of sheet-metal bent into a loop partly encircling the pin in the arm with its forward end adapted to suspend the staple as itis fed off from the staplecore and its opposite end extending rearwardly from the loop, and a spring engaging the rearward end of the supporter to normally maintain it in position tosupport the staple beneath the staple-driver.

9. In a machine of the type specified, the combination of a hollow arm, a staple-core extending the arm and adapted to have the staples straddled thereacross to be fed therealong, a staple-driverv reciprocable across the forward end of the staple-core, a staplesupporter pivoted between the sides of the staplecore with one end extending forwardly to support the foremost staple as it is fed off from the core and its opposite end extending rearwardly from the pivot, and a leaf-spring secured against the bottom of the staple-core with its end acting against the rearward end of the staple-supporter to rock the latter into position to suspend the staple beneath the staple-driver.

10. In a machine of the type specified, the combination of a hollow arm, a channel-shaped staple-core extending longitudinally within the arm and secured to the bottom thereof, said core being slitted on its bottom with a portion of the metal bent upwardly to provide an abutment, a staple-supporter pivoted between the sides of the v clincher -anvil -helical spring acting staple-core with its forward end adapted to prol ject beneath the head of a staple fed off from the core, a pin extending between the sides of the staple-core, and a leaf-spring held beneath the pin with its rearward end engaging the abutment on the bottom of the core and its forward end acting against the staple-supporter to rock the latter into position to suspend the foremost staple beneath the staple-driver.

11. In a machine of the type specified, the combination of a base having a circular opening at its forward end provided with a counterbore at the top and beveled outwardly at the bottom, notches on its beveled interior, a clincher-anvil seated in the counterbore of the opening in the base and provided with clinching-grooves of different arrangement on its upper face, plungerpins slidable radially on the underside of the to adapt their ends to engage the notches on the beveled interior of the opening in the base whereby to hold the anvil in place and adapt it to be turned rotatively to bring the different sets of clinching-grooves into operative position, and a staple-driver supported above the base in cooperative relation with the clincheranvil.

12. In a machine of the type specified, the combination of a hollow base having a circular opening counterbored to provide a recess at the top and formed with beveled sides at its bottom with notches in said beveled sides, a relatively flat clincher-anvil seated in the recess of the opening in the base and provided with different sets of clincher-grooves on its upper face, bearings on the underside of the clincher-anvil disposed radially with respect to its axis, plunger-pins slidable in said bearings with their projecting ends adapted to engage the notches in the beveled sides of the opening in the base, a spring acting between the plunger-pins to maintain their ends projected from the bearings, an arm supported above the base, a plunger reciprocable on said arm, and a staple-driver reciprocable from the plunger to adapt it to drive the staples through the work with the anvil cooperating therewith to clinch the legs of the staple against the underside of the work.

13. In a machine of the type specified, the combination of a base having a circular opening in its top provided with a recessed seat, the lower walls of the opening being inclined outwardly and formed with notches, a clincher-anvil seated in the recess of the opening in the base and provided with differently disposed clinchinggrooves on its upper face, radially disposed bearings on the underside of the anvil, plunger-pins slidable in said bearings and provided with pointed ends adapted to be projected into the notches in theA beveled sides of the opening in the base, a between said plungers to maintain them engaged with the notches, an arm supported above the base, and a staple-driver reciprocable on the arm for driving the staples through the work to engage their legs with the grooves in the anvil to clinch them against the underside of the work.

14. In a machine of the type specified, the combination of a base, a hollow arm supported above the base, a staple-core extending longitudinally within the arm to adapt it to receive the staples in straddled relation thereon, astaplepusher straddling the sides of the core and slidable thereon, a volute spring anchored at the forward end of the arm with its end extending rearwardly across the top of the staple-pusher, a

finger-knob mounted abov' the spring, and a stirrup overlying the finger-knob with its legs extending down through openings in the spring and the top of the pusher and bent over to fasten the parts together.

15. In a machine of the type specied, the combination of a base, staple-driving means movable with respect to the base, an anvil mounted to rotate about a vertical axis on the base and provided with clinching-grooves of different arrangement on its upper face, datent-means radially movable with respect to the axis of the anvil, and means cooperating therewith to retain the anvil in different positions of adjustment with the clinching# grooves in cooperative relation' to the staple` driving means, said datent-means and the means cooperating therewith being so constructed as to adapt them to be automatically released by forcibly turning'the anvil.

16. In a machine of the type specified, the combination of staple-driving means, a base arranged below the staple-driving means, am anvil rotatably mounted on the base and provided with clinching-grooves of dierent arrangement on its upper face, a plunger slidable radially of the axis of the anvil, and means engageable by the plunger to lock the anvil in diierent positions with the clincher-grooves in cooperative relation to the staple-driving means, said plunger and the means engageable therewith being so shaped as to adapt them to be automatically released by forcibly turning the anvil.

17. In a machine of the type speciied, the combination of staple-driving means, a base beneath the staple-driving means, an anvil rotatably adjustable on said base, a plunger-pin slidable radially of the anvil, resilient means for sliding the plunger-pin, and detent-notches in the base engageable by the end of the plunger to lock the anvil in different positions of ad- ,justment ARTHUR H. MAYNARD. 

